La_(1-x)Sr_xFeO_3的导电及感湿机理研究  

Mechanism of Conduction and Humidity Sensing of Le_(1-x)Sr_xFeO_3 Ceramics

作　　者：李标荣[1] 张靖漓[1] 唐超群[1] 卢跃东[2] 

机构地区：[1]华中理工大学 [2]东莞电子工业总公司

出　　处：《传感技术学报》1993年第4期1-5,共5页Chinese Journal of Sensors and Actuators

摘　　要：本文研究了La_(1-x)Sr_xFeO_3的导电特性和湿阻特性.通过正电子湮没谱的研究和导电特性的分析得出以下结论:La_(1-x)Sr_xFeO_3的体导电属“跳跃式”机制,电导率的大小由[Fe^(4+)]决定;吸附水分子的作用类似施主,它使表面Fe^(4+)/Fe^(3+)净比率降低,造成表面载流子浓度减少,使得La_(1-x)Sr_xFeO_3的表面电阻随相对湿度的增大而增大.The electrical and humidity-resistance properties of La1_xSrxFeO3 have been investigated in this paper. By positron annihilation study and electrical property analysis, the following results are obtained: the intrinsic conduction belongs to 'hoping conduction model'. Adsorbed water molecule like an electron-donator which cause the net ratio Fe4+/Fe3+ decreases and the surface resistance increases.

关 键 词：La1-xSrxFeO3 导电性 正湿阻 

分 类 号：TM283[一般工业技术—材料科学与工程]